Means to prevent condensation of water on glass windows.



T.GARENOE. MEANS -TO PREVENT OQNDENSATION OF WATER ON'GLASS WINDOWS.

' APPLICATION FILED JULY a1, 1913.

Patented Feb. 9, 1915.

. I N V EN TOR 1720mm Gare/3w,

ATTORNEY.

HE IyORR/s PETERS CQH-PHOI'O-LITHO WASHINhIu/l n 1 ion 1 THOMAS- CARENCE, OE KANSAS CITY, MISSOURI.

MEANS T0 IREVENT CONDENSATION OF WATER 0N GLASS VVINDOVTS.

Application filed. July 31, 1913.

To all whom it may concern Be it known that T, THOMAS Cnnnnon, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Tmprovements in Means to Prevent Condensation of Water on Glass Windows, of which the following is a specification.

This invention relates to devices for preventing the condensation of water upon the inner surfaces of glass windows of locomotive cabs, motor driven cars, and the like.

It is well known that in locomotive cabs in cold weather, the inner faces of the lookout windows quickly become fogged by condensation thereon from the moist atmosphere in the cab; thereby necessitating the very frequent wiping of the glass to remove the deposit in order that the engineers view of signals be unobstructed. The same con ditions prevail, of course, in the motormans compartments of electrically driven locomotives and electrically driven passenger cars.

The object of this invention is to keep such lookout windows clear and dry, automatically, and especially in cold weather or at high altitudes where the temperature is always low.

In order that the invention may be fully understood, reference will now be made to the accompanying drawings, in which:

Figure 1 is an inner side elevation of a locomotive cab window provided with my improv ment's. Fig. 2 is a vertical section thereof, taken on a line TI1I of Fig. 1. Fig. 3 is an outer side elevation of the upper portion of the window, and Fig. t is a horizontal section thereof, taken on a line TV of Fig. 3.

1 designates the outer frame, which may be of any usual construction. The glass pane 2 is located in the upper panel. In said panel is a rectangular opening in which is fitted a sheet-metal frame 3. Said frame is formed with inturned flanges 4, 5, 6, at its top, sides and bottom. Said flanges are to be at the inner side of the window. A shoulder 7 formed in said frame 3 forms a seat for the pane 2, which is fastened in place by moldings 8, 9, 9. Upon its outer side, the sheet-metal frame is provided with out vardly turned flanges 10, 12, 13, at its top, sides and bottom. Said flanges are secured to the outer frame 1 with screws (not Specification of Letters Patent.

Patented Feb. 9,1915.

Serial No. 782,314.

shown). While the vertical edges of the pane 2 are framed in the said frame 3, its upper and lower edges are not directly framed thereby. The top and bottom of said pane stop short of the top and bottom of said frame, in order to provide air ducts 14- and 15, each of which passes through the window frame. The top strip or molding 9 of the pane 2 forms the bottom wall of duct 14, while the bottom strip or molding 9 forms the top of the lower duct 15. Said ducts are provided with sheet-metal linings 16, mounted on said moldings 9, 9.

Arranged to open or close the lower and intake duct 15, is a movable valve 17 formed of a rectangular strip of sheet metal 17, fixedly mounted upon a rockable stem 18 whose ends are pivoted in circular holes in the sheet-metal frame. Said valve stem is placed in contact with the top of the duct. The valve 17 is to be sulliciently wide to project beyond the outer plane of the frame 1 when open. For adjusting and fastening said valve, I employ a lever 19, secured at one end to stem 18 and extending toward the inner side of the window. Said lever is provided with a screw 20, on which is a thumb-nut 21. Said screw passes freely through an arcuate slot 22 in a sectorshaped fastening plate 23, having a foot 23, secured to frame 1 with screws 2st. The lever and thumb-nut lying at opposite sides of said plate, it is obvious that the valve 17 may be fastened in any position by tightening said thumb-nut.

The upper and outward air duct 14, communicates with atmosphere through an upwardly and inwardly curved duct 25, formed by a hood 2627. The outer wall of said hood comprises the arched portion 26 and the inwardly and downwardly inclined portion 27. The lip 26 of portion 26 is spaced above the outer edge of an outwardly projecting flange 28 on frame 3. The lower portion 27 is provided with an upturned flange 27 which is spaced from the top molding 9 as shown.

The frame flanges 5, 6 are spaced from the pane 2 as shown. The upright flanges 5, at the sides of the pane, form lateral airstream walls, and assist in the conduction of the air-stream, as will be described.

The operation will be substantially as follows: When the outside temperature is warm or moderate, the angular position of the valve is practically immaterial, unless it be considered as a ventilator. When the out side temperature is cool enough to cause condensation upon the inner face of the pane, the engine driver opens the valve 17. The window, being in the front of a cab or coach, receives a strong airresistance, which causes a strong current of air to enter the intake 15. Also a suction will be created at the hood orifice 26, said suction drawing a stream of air from the inner face of the window and discharging it to atmosphere. .Said suction causes the stream of air to follow the pane from bottom to top, said stream being in part guided by the sheet metal flanges 5. Owing to the draft through the hood 2 6-27, air will also be sucked up through the slot between the hood and the window strip 9. Thus, an upward stream of air will traverse the outer face also of the pane, as indicated by full-line arrows. It will be evident that no condensation can occur upon the glass in the presence of the I swift air stream flowing over said pane,

no matter how low the outside temperature may be, within limits. The top of the flange 28 forms a gutter and prevents the entrance of water into the air duct 14. The outer stream of air Which is more powerful than the inner stream is prevented from retarding the latter by a lip 29 extending up wardly to a point adjacent the slot or orifice 26, from the upper lining.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. In a window, a glass pane, a sheetmetal frame for said pane, said frame eX- tending above the top and below the bottom of the pane to provide air ducts; angular flanges on the opposite sides of said frame, said flanges being directed toward one an other and forming partly closed air-stream walls, and means having communication with one of said air-ducts, for drawing air outward through said duct.

A glass pane, a sheet-metal frame for said pane, said frame extending above the top and below the bottom of the pane to provide air ducts; a manually movable valve adapted to close and open one of said ducts; and means communicating with the other of said ducts, for drawing air through said other duct from the inner to the outer side of the window.

3. In a window, a sheet-metal window frame having an air duct through its upper portion and an air-duct through its lower portion; a glass pane set in said frame; and a hood mounted on said frame in communication with said upper duct said hood having an induction orifice opening to atmosphere at the top of the pane, and having an eduction orifice opening to the atmosphere, said eduction orifice facing the outer side of the window frame.

4%. In a window, a sheet metal window frame having an air-duct through its upper portion and an air-duct through its lower portion; a glass pane set in said frame; a hood mounted on said frame in communication with said upper duct, said hood having an induction orifice open to atnmsphere at the top of the pane, and having an eduction orifice opening to the atmosphere and facing the outer side of the window frame, and a lip extending into said hood, for the purpose described.

In testimony whereof I aflix my signature, in the presence of two witnesses.

THOMAS CARENCE.

\Vitnesses F. G. FISCHER, K. N. IMBonnN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

